An acoustic vector sensor (AVS) measures all the three components of the acoustic particle velocity and the pressure at a single point in space. Through real experiments, the study evaluated the advantages of AVS for source localizing problems, compared with standard pressure sensor arrays. For this aim, we built a linear array of four AVS and design a graphical user interface for processing the measurements and estimating the source location in 3D. This research considered the source identifiability using a single AVS, as well as 3D location estimation using a linear array of AVS.
Estimate the position of an acoustic source using spatial and temporal measurements of pressure and particle acoustic field
Physical modeling of the propagation of an acoustic waveform through the air.
• Statistical analysis of pressure and particle velocity measurements taken by an array of acoustic vector sensors .
Assisted navigation, defense, teleconference, vibration analysis
Acoustic vector sensor (AVS)
Euler equation
AVS pressure-sensor-measurement noise particle-velocity-measurement noise
Multiple AVS and single source model
Far acoustic field pressure at position r and time
particle velocity at position r and time
speed of sound, direction of particle velocity
Ambient pressure
Single AVS and source model
Signal conditioner
DAQ
Illustration of the main components of our experimental setup
Capon Spectra
SNR1 = SNR2 = SNR
Figure:Photograph of a three dimensional sound intensity probe consisting of one pressure sensor and three particle velocity sensors mounted together (Source:
Microflown Technologies, B.V.)
sample-correlation matrix for
samples
• A. Nehorai and E. Paldi, ``Acoustic vector sensor array processing,"
, pp. 192-198, Pacific Grove, CA, Oct. 1992.
• A. Nehorai and E. Paldi, "Acoustic vector-sensor array processing,"
, Vol. SP-42, pp. 2481-2491, Sept. 1994.
• M. Hawkes and A. Nehorai, "Acoustic vector-sensor beamforming and capon direction estimation,"
, Vol. SP-46, pp. 2291-2304,
Sept. 1998.